Flight #: 9 STABILITY AND CONTROL CHECKS |
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Pilot: |
Date: |
Time: |
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Objectives:
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Check |
Action |
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PRE-FLIGHT |
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These tests cannot be accomplished until any necessary trim tabs have been installed so the aircraft can be flown hands off |
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DEPARTURE |
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Do not use flaps |
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Climb out at 110 MPH |
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Climb to 6000 MSL and level off |
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CRUISE |
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Limit prop RPM to 2300 |
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Check engine gauges especially CHT and Oil Temp |
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Trim hands off level flight |
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NOTES
Check |
Action |
LONGITUDINAL STABILITY TEST |
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Record airspeed at 2300 RPM (Airspeed ___ = A) |
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Lightly pull on stick to reduce airspeed by 10% |
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New airspeed: A-10%= ___ = B |
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Does the acft. require continued pull force to maintain the new airspeed? |
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If yes: Pull stick to reduce airspeed to A-20% =___= C |
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Does acft. require still more pull force to maintain airspeed C? |
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If yes: N9X has POSITIVE static stability |
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If no to either B or C airspeed, N9X has NEUTRAL static stability |
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If N9X requires a push force for B or C airspeeds, then N9X has NEGATIVE static stability |
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---- repeat test using a PUSH test instead of PULL test |
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TEST FOR POSITIVE DYNAMIC LONGITUDINAL STABILITY (SHORT PERIOD) |
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Trim for cruise @ 2300 RPM |
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Push nose down 5 degrees, then up to level attitude |
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As attitude reaches level, release stick |
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If N9X briefly oscillates about the trim attitude before settling at trim attitude then N9X has POSITIVE DYNAMIC LONGITUDINAL STABILITY (SHORT PERIOD) |
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NOTES
Check |
Action |
TEST FOR POSITIVE DYNAMIC LONGITUDINAL STABILITY (LONG PERIOD) |
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Trim for cruise @ 2300 RPM, Record Airspeed ___ = A |
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Pull stick for A - 5 MPH and release stick |
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Expect N9X to oscillate about the trim speed before in dampens out |
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If amplitude INCREASES with time = NEGATIVE DLS |
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If amplitude CONTINUES to oscillate = NEUTRAL DLS |
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If N9X returns to cruise trim & speed = POSITIVE DLS |
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TEST FOR LATERAL/DIRECTIONAL CONTROL STABILITY |
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Set low cruise speed (BELOW MANEUVERING SPEED) & trim |
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Slowly enter a sideslip until either full rudder or full aileron deflection |
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Release aileron while holding full rudder |
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---> low wing should raise to level |
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TEST FOR STATIC DIRECTIONAL STABILITY |
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Set low cruise speed (BELOW MANEUVERING SPEED) & trim |
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Slowly yaw N9X with rudder while keeping acft level with aileron ----- release rudder |
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N9X should return to no yaw condition |
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NOTES
Check |
Action |
TEST SPIRAL STABILITY |
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(This will demonstrate the aircraft's tendency to raise the low wing when controls are released in a bank) |
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Bank 15 to 20 degrees and release controls |
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---> If bank angle DECREASES = POSITIVE SS |
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---> If bank angle STAYS THE SAME = NEUTRAL SS |
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---> If bank angle INCREASES = NEGATIVE SS |
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LANDING |
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Use checklists |
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Fly pattern at 85 MPH |
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Taxi back and "Smile" |
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POST FLIGHT |
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Prepare corrective action list |
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Record fuel and oil consumption |
NOTES